Yes, there are some. You can start by looking on popular fanfiction websites like Archive of Our Own. There you might find a variety of stories exploring the relationship between Caius and Lightning. Some could be adventure - based where they go on quests together, while others might focus more on the development of their relationship in different fictional scenarios.
Another theme is redemption. Caius, being a somewhat villainous character in the original, is sometimes given a chance at redemption through his relationship with Lightning. It gives a new perspective on his character. For instance, in some stories, Lightning's unwavering sense of justice makes Caius re - evaluate his own actions.
Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfictions from various fandoms. Just use the search function and type in 'Caius x Lightning' and you'll get a list of relevant stories.
One popular Lightning x Caius fanfiction is 'The Unlikely Bond'. It explores how their different personalities interact in a post - apocalyptic world within the game's universe. The story is full of action and some emotional moments as they gradually come to understand each other.
Often, bella x caius fanfiction features a relationship that is somewhat dark and intense. Caius being part of the Volturi has his own set of power and authority, which adds an element of danger to the relationship with Bella.
One popular 'bella x caius fanfiction' is 'A Different Kind of Love'. It explores a unique relationship between Bella and Caius, delving into how their personalities clash and then gradually find common ground. The story is filled with emotional moments and interesting plot twists.
Often, there's the theme of redemption. Maybe Hope has some past mistakes he wants to make up for, and Lightning helps him through it. Or it could be about the power of their friendship evolving into something more romantic. Writers also like to explore how they deal with the aftermath of the events in 'Lightning Returns', like the changes in the world and how it affects their bond.
There is definitely some. Fanfiction.net also has a collection. However, the quality can vary greatly. Some stories might be well - written with great plotlines and character development, while others could be more amateurish. It really depends on what you're looking for. If you like a more action - packed story, look for ones with a lot of battles or challenges that Zack and Lightning face together.
The plot is crucial. It could be a love story, but add some twists and turns. Maybe the OC has a secret that could either bring them closer to Aro, Caius, and Marcus or drive them apart. Also, the setting should be well - described. If it's in a vampire - dominated world, describe the vampire society, their rules, and how the OC fits into it. Use vivid language to make the readers feel like they are in that world.
A theme that often appears is the OC's struggle for acceptance in their world. The Volturi (where Aro, Marcus, and Caius belong) have their own rules and ways. So, the OC might face challenges in being accepted by them, or in changing their ways. It can also be about the OC's discovery of the vampire world. Maybe they are a human turned into a vampire or just a human who stumbles upon this world and has to deal with Aro, Marcus, and Caius. This can lead to themes of fear, wonder, and adaptation.